Update the README.md

pdm-project · Jun 2, 2022 · c6e4f3d · c6e4f3d
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diff --git a/README.md b/README.md
@@ -34,6 +34,7 @@ The following simple example installs `dev` and `test` dependencies into the ven
 ```ini
 [tox]
 envlist = py37,py38
+isolated_build = True  ; This is required for a pyproject.toml based project.
 
 [testenv]
 groups =  ; Dependency groups in pyproject.toml